JP6733181B2 - Fuel auxiliary tank - Google Patents

Description

The present invention relates to a fuel auxiliary tank for a fuel supply system that handles a plurality of types of fuels, and more particularly to a fuel auxiliary tank capable of agitating fuel with a relatively short time and low labor while suppressing an increase in device cost.

Conventionally, in a thermal power plant that uses a plurality of types of oils such as high-viscosity oil (crude oil) and low-viscosity oil (heavy oil) as fuel, as shown in FIG. 5, for example, a plurality of fuel storage tanks 61 for storing these fuels, A fuel supply system is configured by including 62 and a heavy crude oil auxiliary tank (fuel auxiliary tank) 40. In such a fuel supply system, the fuel from the fuel storage tanks 61 and 62 is once supplied to the heavy crude oil auxiliary tank 40 by the oil feed pump 53, and further, the pressure is adjusted to the proper pressure for burner combustion by the heavy crude oil injection fuel pump 54. After raising it, it will be supplied as fuel for the boiler.

Here, the fuel used is regularly delivered from the fuel storage base, but the same type of fuel is not always procured, and the type of fuel used is determined daily based on the economical operation of the unit. It is what is done. That is, different types of fuel (heavy oil, crude oil, etc.) are received in the fuel storage tanks 61, 62, and are selectively used in consideration of economical operation and exhaust gas environmental regulation values (NOx, SOx, etc.).

Therefore, due to the operation of the fuel supply system, the fuel type may be switched in the heavy crude oil auxiliary tank 40, but since the agitator is not installed in the heavy crude oil auxiliary tank 40, as shown in FIG. The fuel 101 having a high specific gravity may be separated from the fuel 101. For example, when switching the fuel type from a low-viscosity fuel (heavy oil) having a light specific gravity to a high-viscosity fuel (crude oil) having a heavy specific gravity, the heavy fuel is supplied to the fuel having a low specific gravity, but in the heavy crude oil auxiliary tank 40. Therefore, the fuel having a low specific gravity remains in the upper portion of the heavy crude oil auxiliary tank 40 without being mixed uniformly.

Normally, a heater for heating the fuel in the tank is installed at the bottom of the heavy crude oil auxiliary tank 40. However, when the fuel 101 having a low specific gravity and the fuel 102 having a high specific gravity are separated, the upper portion of the heavy crude oil auxiliary tank 40 is The problem that heat does not reach the upper part of the fuel 101 having a low specific gravity and solidifies, and the float of the fuel gauge (float type level gauge) 11 is pushed down, and the fuel gauge 11 does not show an accurate fuel level in the tank. was there. In order to solve this, at present, the level swing of the heavy crude oil auxiliary tank 40 is carried out after the power supply is requested to keep the power generation output constant. Here, the level swing means that when the fuel is switched (or periodically), the fuel level in the tank in the operating state is lowered to the required head pressure limit of the fuel injection pump 54, and the fuel level in the tank is raised again. By repeating a series of operations, the fuel in the heavy crude oil auxiliary tank 40 is physically mixed. In order to carry out this level swing, it is necessary to arrange one monitoring/operator in the central control room and one person in the field, and perform it in perfect condition, which takes about half a day and labor. ing.

On the other hand, as a method for coping with the phase separation of a relatively high-viscosity fuel, there is, for example, Patent Document 1. This Patent Document 1 uses a water storage tank equipped with a stirring unit as a method for slurrying coal capable of suppressing separation of coal and liquid phase for a relatively long period. When the motor disposed above rotates, the motor shaft rotates and the stirring blades of the stirring unit provided at the bottom of the tank rotate to stir the coal-like liquid material in slurry form and separate the coal-like liquid material. Techniques for preventing are disclosed.

JP, 2005-52071, A

As described above, in the method of performing the level swing of the heavy crude oil auxiliary tank 40 to mix the different types of fuel in the tank, there is a situation that the operation requires time and labor. Further, as in Patent Document 1, the method of installing the stirring unit in the heavy crude oil auxiliary tank 40 to stir the entire area of the tank increases the device cost, and additionally installs the stirring unit in the existing heavy crude oil auxiliary tank 40. Therefore, there is a problem that large-scale repair work is required.

Therefore, an object of the present invention is to provide a fuel auxiliary tank capable of agitating fuel in a relatively short time and with a low labor while suppressing an increase in device cost.

In order to solve the above-mentioned problems, the invention of claim 1 uses a first type liquid fuel, a second type liquid fuel having a viscosity or specific gravity different from that of the first type liquid fuel, or a mixed liquid fuel thereof as a fuel. A fuel auxiliary tank provided in a fuel supply system for an operating load, wherein the fuel supply system pressure-feeds the first type liquid fuel or the second type liquid fuel to an inlet of the fuel auxiliary tank. The liquid feed means includes a liquid feed means and a second liquid feed means for feeding the fuel delivered from the outlet of the fuel auxiliary tank to the load by pressure, and is fixed to a bottom portion of the fuel auxiliary tank to feed the fuel auxiliary tank. the jet of fuel being pumped from the first fluid feeding means through an inlet, have a baffle member, for converting the rising swirling flow along the side peripheral inner wall surface of the fuel auxiliary tank, said baffle member, A curved surface that is concave with respect to the injection flow of the fuel and has a larger radius of curvature on the opposite side of the upward swirling flow than on the direction side of the upward swirling flow. ..

A second aspect of the present invention is a fuel supply system for a load that operates using a first type liquid fuel, a second type liquid fuel having a viscosity or a specific gravity different from that of the first type liquid fuel, or a mixed liquid fuel of these types as a fuel. A fuel auxiliary system, wherein the fuel supply system includes a first liquid feeding means for pressure-feeding the first type liquid fuel or the second type liquid fuel to an inlet of the fuel auxiliary tank; A second liquid sending means for sending the fuel sent from the outlet of the tank to the load under pressure, the second liquid sending means being fixed to the bottom portion of the fuel auxiliary tank, and the first feed through the inlet of the fuel auxiliary tank. A baffle member for converting an injection flow of the fuel pressure-fed from the liquid means into an ascending swirl flow along the side circumferential inner wall surface of the fuel auxiliary tank, the baffle member with respect to the injection flow of the fuel. It is provided with a curved surface that curves in a concave shape, is fixed to the bottom portion of the fuel auxiliary tank near the outlet, the curved surface is formed to be inclined toward the outlet, and the curved surface is formed in the fuel injection flow direction. when viewed,該湾curved surface is formed so as to cover the outlet, characterized in that.

A third aspect of the present invention is a fuel supply system for a load that operates using a first type liquid fuel, a second type liquid fuel having a viscosity or specific gravity different from that of the first type liquid fuel, or a mixed liquid fuel thereof as a fuel. A fuel auxiliary system, wherein the fuel supply system includes a first liquid feeding means for pressure-feeding the first type liquid fuel or the second type liquid fuel to an inlet of the fuel auxiliary tank; A second liquid sending means for sending the fuel sent from the outlet of the tank to the load under pressure, the second liquid sending means being fixed to the bottom portion of the fuel auxiliary tank, and the first feed through the inlet of the fuel auxiliary tank. A baffle member for converting an injection flow of the fuel pressure-fed from the liquid means into an ascending swirl flow along the side circumferential inner wall surface of the fuel auxiliary tank, the baffle member with respect to the injection flow of the fuel. The first curved surface curved in a concave shape and the second curved surface curved in a convex shape substantially in parallel with the side peripheral surface of the fuel auxiliary tank are arranged so that the horizontal cross-sectional shape is substantially an inverted S-shape. The connected member is formed by being fixed to the bottom portion of the fuel auxiliary tank near the inlet, and the first curved surface or the second curved surface is opposite to the side circumferential inner wall surface of the fuel auxiliary tank. inclined are formed on, characterized in that.

A fourth aspect of the present invention is the fuel auxiliary tank according to any one of the first to third aspects, wherein the fuel is fixed to a side circumferential inner wall surface of the fuel auxiliary tank and the flow direction is changed by the baffle member. It is characterized by having a first guide member for guiding the injection flow of (1) so as to be an ascending swirl flow along the side circumferential inner wall surface of the fuel auxiliary tank.

According to a fifth aspect of the present invention, in the fuel auxiliary tank according to the second aspect, the injection flow of the fuel, which is fixed to the curved surface of the baffle member and whose flow direction is changed by the baffle member, is provided around the side circumference of the fuel auxiliary tank. It is characterized in that it has a second guiding member for guiding so as to make an upward swirling flow along the inner wall surface. According to a sixth aspect of the invention, in the fuel auxiliary tank according to the third aspect, the fuel is fixed to the first curved surface or the second curved surface of the baffle member and the flow direction is changed by the baffle member. It is characterized by having a second guide member for guiding the injection flow so as to be an ascending swirl flow along the side circumferential inner wall surface of the fuel auxiliary tank.

According to a seventh aspect of the present invention, in the fuel auxiliary tank according to any one of the first to sixth aspects, the fuel auxiliary tank is installed on a side circumferential inner wall surface of the fuel auxiliary tank. It is characterized by having an accelerating means for accelerating the ascending swirling flow.

According to the invention of claim 1, the injection flow of the fuel, which is fixed to the bottom portion and is pressure-fed from the first liquid feeding means via the feed port, is made into the upward swirling flow along the inner wall surface of the side periphery of the fuel auxiliary tank. Since the baffle member for converting is provided, when the fuel is supplied to the fuel auxiliary tank, a rising swirl flow is always induced in the fuel in the fuel auxiliary tank, and the fuel pressure-fed by the first liquid feeding means is naturally stirred. Therefore, the fuel in the fuel auxiliary tank can be made uniform. In particular, when the fuel is switched between different types of fuel, the fuel conversion can be performed without requiring the special operation which has been conventionally performed. Further, since there is no restriction such as restraining the generator output at the time of fuel switching and the fuel switching can be performed at any time, the range of fuel operation can be expanded.

According to the invention of claim 2, the baffle member is provided with a curved surface curved in a concave shape with respect to the fuel injection flow, the baffle member is fixed to the bottom portion in the vicinity of the delivery port, and the curved surface is inclined toward the delivery port side. Since the curved surface is formed so as to cover the delivery port when the curved surface is viewed in the fuel injection flow direction, a swirl flow is induced by the curved surface of the baffle member and the inclination of the curved surface is increased. As the upward flow is induced at an angle, it becomes possible to efficiently convert the injection flow of the fuel to be pumped into the upward swirling flow along the inner wall surface of the side circumference, and perform efficient natural stirring of the fuel. be able to.

According to the invention of claim 3, the baffle member has a first curved surface curved in a concave shape with respect to the fuel injection flow, and a second curved surface curved in a convex shape substantially parallel to the side circumferential surface. A member that is connected so that its horizontal cross-sectional shape is a substantially inverted S shape is fixed to the bottom near the inlet, and the first curved surface or the second curved surface is opposite to the side circumferential inner wall surface. Since it is formed so as to be inclined toward the side of the second curved surface, the injection flow of the fuel whose direction is changed by the first curved surface is guided by the second curved surface so as to be an ascending swirl flow along the inner wall surface of the side circumference. Therefore, it becomes possible to efficiently convert the injection flow of the fuel that is sent under pressure into an ascending swirl flow along the inner wall surface of the side circumference, and it is possible to efficiently agitate the fuel naturally.

According to the invention of claim 4, the fuel injection flow whose flow direction is changed by the baffle member by the first guide member fixed to the inner peripheral wall surface of the auxiliary fuel tank is swung up along the inner peripheral wall surface. Therefore, it is possible to reduce the loss in the flow path of the upward swirling flow along the inner wall surface of the side circumference, and to realize efficient natural stirring of fuel.

According to the fifth and sixth aspects of the invention, the fuel injection flow whose flow direction is changed by the baffle member by the second guide member fixed to the curved surface, the first curved surface or the second curved surface of the baffle member. Is guided so as to form an ascending swirl flow along the inner wall surface of the side circumference, so that the passage loss of the ascending swirl flow induced by the baffle member can be reduced, and efficient natural stirring of fuel can be realized.

According to the invention of claim 7 , for example, even when the upward swirling flow cannot reach the upper layer portion of the fuel only by the fuel injection flow by the first liquid feeding means, the inside of the side circumference of the fuel auxiliary tank Since the ascending means installed on the wall surface can accelerate the upward swirling flow along the inner wall surface of the side circumference, the fuel can be surely stirred .

FIG. 1 is an explanatory view of a fuel auxiliary tank according to Embodiment 1 of the present invention, FIG. 1(a) is a cross-sectional view of the fuel auxiliary tank seen from above, and FIG. 1(b) is a side view of the fuel auxiliary tank. FIG. FIG. 6 is a perspective view illustrating a modified example of the baffle member in the fuel auxiliary tank according to the first embodiment. FIG. 3 is an explanatory view of a fuel auxiliary tank according to Embodiment 2 of the present invention, FIG. 3(a) is a cross-sectional view of the fuel auxiliary tank seen from above, and FIG. 3(b) is a side view of the fuel auxiliary tank. FIG. 4A and 4B are explanatory views of a fuel auxiliary tank according to Embodiment 3 of the present invention, FIG. 4A is a cross-sectional view of the fuel auxiliary tank seen from above, and FIG. 4B is a side view of the fuel auxiliary tank. FIG. It is a conventional heavy crude oil auxiliary tank (fuel auxiliary tank) and a fuel supply system.

Hereinafter, the present invention will be described based on the illustrated embodiments.

(Embodiment 1)
1 is an explanatory view of a fuel auxiliary tank 10 according to Embodiment 1 of the present invention, and FIG. 1(a) is a cross-sectional view of the fuel auxiliary tank 10 seen from above, illustrating the structure inside the tank and the flow of fuel. FIG. 1B shows the structure of the fuel auxiliary tank 10 and its peripheral devices in the fuel supply system, and illustrates the internal structure of the tank and the flow of fuel in a sectional view of the fuel auxiliary tank 10 seen from the side. ..

The fuel supply system according to the first embodiment includes fuel storage tanks 61, 62 and adjusting valves 63, 64 (not shown) as in FIG. 62 is switchably connected. In addition, as shown in FIG. 1B, the fuel supply system includes a fuel auxiliary tank 10, an oil feed pump (first liquid feed means) 53, an injection fuel pump (second liquid feed means) 54, and an adjusting valve 51, 52 is provided.

The fuel storage tanks 61 and 62 store the first type liquid fuel or the second type liquid fuel having a viscosity or specific gravity different from that of the first type liquid fuel. The fuel is once supplied to the auxiliary tank 10 by the oil feed pump 53, further raised to an appropriate pressure by the fuel injection pump 54, and then supplied as the boiler fuel. Here, the heterogeneous liquid fuels having different viscosities or specific gravities (first type liquid fuel and second type liquid fuel) include crude oil and heavy oil (A heavy oil, B heavy oil or C heavy oil).

The fuel auxiliary tank 10 is fixed to the bottom surface 10a, and the injection flow (Q1a) of the fuel pressure-fed from the oil feed pump 53 through the inlet 13 rises along the inner wall surface of the side circumference 10c of the fuel auxiliary tank 10. The fuel injection flow (Q1a), which is fixed to the baffle member 15 that converts into a swirl flow (Q1b) and the inner wall surface of the side circumference 10c, and whose flow direction is changed by the baffle member 15, rises along the inner wall surface of the side circumference 10c. The first guide members 16 and 17 for guiding the swirl flow (Q1b). In FIG. 1, 10b is the upper surface of the fuel auxiliary tank 10, 11 is a fuel meter (float type level meter) for measuring the fuel level of the fuel 100 in the fuel auxiliary tank 10, 12 is a heater heating tube, and 14 is a sending tube. The outlet 12a indicates the direction of the heated steam flowing in the heating pipe 12.

The baffle member 15 has a curved surface that is concavely curved with respect to the fuel injection flow (Q1a), and is fixed to the bottom surface 10a in the vicinity of the delivery port 14 via a mounting member (not shown). As shown in FIG. 1A, a heating pipe 12 of a heater is stretched around the bottom surface 10a of the fuel auxiliary tank 10 (a position at a predetermined height from the bottom surface 10a), and the baffle member 15 is The heating pipe 12 is attached to avoid the heating pipe 12 or to straddle the heating pipe 12. Here, in the case where the heating pipe 12 is mounted across the heating pipe 12, a notch portion may be formed at a corresponding portion of the baffle member 15. The baffle member 15 may be attached to the bottom of the fuel auxiliary tank 10, and the baffle member 15 is fixed to the inner wall surface of the side periphery 10c of the bottom so as to extend to the baffle member 15 as a structure in which the baffle member 15 floats from the bottom surface 10a. It may be fixed via a mounting member formed as described above.

More specifically, the baffle member 15 is formed by bending a substantially right-angled triangular flat plate, and when the curved surface is viewed in the fuel injection flow direction (Q1a), the curved surface is separated by a certain distance. And is fixed at a position that covers the delivery port 14. By curving the substantially right-angled triangular flat plate, the upper side of the baffle member 15 is made into a three-dimensional upward spiral shape to induce an upward swirling flow, and the curved surface of the baffle member 15 is separated by a certain distance. The fuel injection flow (Q1a) is prevented from directly flowing to the delivery port 14 by covering the above.

Further, the curved surface of the baffle member 15 is mounted on the delivery port 14 side (as a whole, the curved surface of the baffle member 15 is on the inner wall surface side of the side circumference 10c) so as to be inclined at a constant inclination angle. That is, a swirling flow is induced by the curved surface of the baffle member 15, and an ascending flow is induced by the inclination angle of the curved surface of the baffle member 15.

In addition, as shown in FIG. 1A, the curved surface of the baffle member 15 has different curvatures on the swirl flow direction side and the opposite direction side (that is, “curvature radius on swirl flow direction side<reverse swirl flow direction”). The radius of curvature on the side of the direction"). After the fuel injection flow (Q1a) collides with the curved surface of the baffle member 15, a flow is induced in each of the swirling flow direction side and the opposite direction side, but the fuel injection flow (Q1a) rises in the swirling flow (Q1a). For the baffle member 15 whose main purpose is to convert to Q1b), the flow induced on the opposite side of the swirling flow corresponds to the conversion loss, and the flow induced on the opposite side of the swirling flow is reduced as much as possible. Is.

The curvature and inclination angle of the curved surface of the baffle member 15 are preset by empirical knowledge or simulation experiments. In particular, since the inclination angle of the curved surface almost determines the rising angle of the ascending swirl flow (Q1b), it is desirable to perform a simulation experiment in advance. The shape and size of the fuel auxiliary tank 10 and the maximum rated pressure of the oil feed pump 53 , The fuel viscosity, temperature, etc. are given as parameters to a predetermined model formula, and the most appropriate rising angle of the rising swirl flow (Q1b) (for example, the rising angle at which the rising swirl flow (Q1b) reaches the highest) And the inclination angle of the curved surface is set based on the rising angle.

Further, since the baffle member 15 has a structure for directly receiving the fuel injection flow (Q1a), the baffle member 15 and its fixing must have a strength enough not to be deformed by a continuous fuel injection flow. It is desirable that the baffle member 15 and the attachment member are made of the same material as the wall surface of the fuel auxiliary tank 10. As a method of fixing the baffle member 15, a structure may be used in which the baffle member 15 is reinforced by a supporting member whose one end is fixed to the bottom surface 10a or the side periphery 10c.

In addition, the first guiding members 16 and 17 are formed of plate-shaped members whose side surfaces in the longitudinal direction have the same curvature as the inner wall surface of the side circumference 10c, and are provided with a predetermined inclination angle in the longitudinal direction to form the side circumference 10c. It is fixed to the inner wall surface via a mounting member (not shown). The inclination angle of the first guide members 16 and 17 is set to an angle substantially equal to the inclination angle of the curved surface of the baffle member 15, and the attachment position of the first guide members 16 and 17 is the dimension and shape of the baffle member 15 and the attachment position. It is preset according to the position. The material of the first guide members 16 and 17 is the same as that of the baffle member 15.

As described above, in the fuel auxiliary tank 10 according to the first embodiment, the injection flow (Q1a) of the fuel that is fixed to the bottom surface 10a and is pressure-fed from the oil feed pump 53 through the inlet 13 is used for the fuel auxiliary tank. Since the structure is provided with the baffle member 15 that converts into an upward swirling flow (Q1b) along the inner wall surface of the side circumference 10c of the fuel cell 10, the fuel inside the fuel auxiliary tank 10 is always supplied when the fuel is supplied to the fuel auxiliary tank 10. Since the upward swirling flow is induced in the fuel 100 and the fuel pressure-fed from the oil feed pump 53 is naturally agitated, the fuel 100 in the fuel auxiliary tank 10 can be made uniform. In particular, when the fuel is switched between different types of fuel, the fuel conversion can be performed without requiring a special operation (level swing) which has been performed conventionally. Further, since there is no restriction such as restraining the generator output at the time of fuel switching and the fuel switching can be performed at any time, the range of fuel operation can be expanded.

Further, in the first embodiment, the baffle member 15 has a curved surface that is concavely curved with respect to the fuel injection flow (Q1a), and when the curved surface is viewed in the fuel injection flow direction (Q1a). Since the curved surface is fixed to the bottom surface 10a at a position covering the delivery port 14, and the curved surface is attached to the delivery port 14 side so as to be inclined at a constant inclination angle, a swirling flow is generated on the curved surface of the baffle member 15. Since the rising flow is induced at the inclination angle of the curved surface, the injection flow (Q1a) of the fuel to be pumped is efficiently changed to the rising swirl flow (Q1b) along the inner wall surface of the side circumference 10c. It becomes possible to convert.

Further, in the first embodiment, the fuel injection flow (Q1a), which is fixed to the inner wall surface of the side circumference 10c and whose flow direction is changed by the baffle member 15, rises the swirling flow (Q1b) along the inner wall surface of the side circumference 10c. ), the first guide members 16 and 17 are provided to guide the fuel flow so that the ascending swirl flow (Q1b) along the inner wall surface of the side circumference 10c is reduced in loss in the flow path, thereby increasing the efficiency of the fuel. It is possible to realize natural agitation.

Further, since only the baffle member 15 and the first guide members 16 and 17 having such a simple structure are attached, efficient natural agitation of fuel can be realized without affecting the tank storage amount. It is possible to realize a fuel auxiliary tank that can stir the fuel in a relatively short time and with a low labor while suppressing the cost increase. Further, even when the baffle member 15 and the first guiding members 16 and 17 are attached to the existing fuel auxiliary tank, simple repair work is sufficient, and an increase in the device cost can be suppressed.

(Modification)
FIG. 2A is a perspective view illustrating Modification 1 of the baffle member 15 in the fuel auxiliary tank 10 according to the first embodiment. The baffle member 15A of Modification 1 has second guide members 15Aa to 15Ac for guiding the fuel injection flow (Q1a) to be an ascending swirl flow (Q1b) along the inner wall surface of the side circumference 10c attached to the curved surface. It has a different structure. The second guide members 15Aa to 15Ac are formed of plate-shaped members whose side surfaces in the longitudinal direction have the same curvature as the curved surface of the baffle member 15A, and are fixed to the curved surface with a predetermined inclination angle in the longitudinal direction. There is. Here, the inclination angles of the second guiding members 15Aa to 15Ac are set to be substantially the same as the inclination angle of the upper side of the baffle member 15A. As described above, by adopting the structure in which the second guide members 15Aa to 15Ac are attached to the baffle member 15A, the flow path loss of the ascending swirl flow induced by the baffle member 15A is reduced, and efficient natural stirring of fuel is performed. Can be realized.

2B is a perspective view illustrating Modification Example 2 of the baffle member 15 in the fuel auxiliary tank 10 according to the first embodiment. The baffle member 15B of Modification 2 is provided with peak portions 15Ba, 15Bb and a valley portion along the slope of the upper side of the baffle member 15A on the curved surface so that the fuel injection flow (Q1a) is on the inner wall surface of the side circumference 10c. This is to induce a rising swirl flow (Q1b). As a result, the flow path loss of the upward swirling flow induced by the baffle member 15B can be reduced, and efficient natural stirring of fuel can be realized.

Further, FIG. 2C is a perspective view illustrating Modification Example 3 of the baffle member 15 in the fuel auxiliary tank 10 according to the first embodiment. In the baffle member 15 of the first embodiment, the swirl flow is induced by the horizontal curvature of the curved surface and the ascending flow is induced by the inclination angle of the curved surface. The surface 15Ca is structured to have a horizontal curvature and a vertical curvature, and a horizontal curvature of the curved surface induces a swirl flow, and a vertical curvature of the curved surface and an inclination angle of the baffle member 15C are used. It is designed to induce an upward flow. As a result, the flow path loss of the upward swirling flow induced by the baffle member 15C can be reduced, and efficient natural stirring of fuel can be realized.

(Embodiment 2)
Next, FIG. 3 is an explanatory view of a fuel auxiliary tank 20 according to Embodiment 2 of the present invention, and FIG. 3A is a cross-sectional view of the fuel auxiliary tank 20 seen from above, showing the structure inside the tank and the fuel auxiliary tank 20. FIG. 3(b) shows the flow of fuel, and FIG. 3(b) shows the device configuration of the fuel auxiliary tank 20 and its surroundings in the fuel supply system, and is a cross-sectional view of the fuel auxiliary tank 20 seen from the side, showing the structure and fuel flow in the tank Is illustrated. The fuel auxiliary tank 20 according to the second embodiment is different from the fuel auxiliary tank 10 according to the first embodiment in the structure and the mounting position of the baffle member and the structure and the mounting position of the first guiding member. This is equivalent to the first form.

The fuel auxiliary tank 20 is fixed to the bottom surface 20a, and the injection flow (Q2a) of the fuel pumped from the oil feed pump 53 through the inlet 23 is lifted along the inner wall surface of the side periphery 20c of the fuel auxiliary tank 20. The fuel injection flow (Q2a) fixed to the inner wall surface of the side circumference 20c and the baffle member 25 for converting into a swirling flow (Q2b) and rising in the fuel injection flow (Q2a) whose flow direction is changed by the baffle member 25 along the inner wall surface of the side circumference 20c. The first guide members 26 and 27 that guide the swirl flow (Q2b).

The baffle member 25 has a first curved surface curved in a concave shape with respect to the fuel injection flow (Q2a) and a second curved surface curved in a convex shape substantially in parallel with the inner wall surface of the side circumference 20c. Is fixed to the bottom surface 20a in the vicinity of the inlet 23, and the first curved surface and the second curved surface are the inner wall surface of the side circumference 20c. Is formed to be inclined to the opposite side.

The baffle member 25 is fixed to the bottom surface 20a via a mounting member (not shown). However, as shown in FIG. 2A, the baffle member 25 is in the vicinity of the bottom surface 20a of the fuel auxiliary tank 20 (a position at a predetermined height from the bottom surface 20a). The heating tube 12 of the heater is stretched around the bracket), and the baffle member 25 is attached to avoid the heating tube 12 or to straddle the heating tube 12. Here, in the case where the heating pipe 12 is attached across the heating pipe 12, a notch portion may be formed at a corresponding portion of the baffle member 25. The baffle member 25 may be attached to the bottom of the fuel auxiliary tank 20. The baffle member 25 is fixed to the inner wall surface of the side circumference 20c of the bottom and extends to the baffle member 25 as a structure in which the baffle member 25 floats from the bottom surface 20a. It may be fixed via a mounting member formed as described above.

Further, the first curved surface of the baffle member 25 has a function of mainly changing the flow direction of the fuel injection flow (Q2a) into a flow substantially parallel to the inner wall surface of the side circumference 10c, and the direction is changed on the first curved surface. This is a structure in which the injected flow (Q2a) of the injected fuel is guided by the second curved surface so that it becomes a rising swirl flow (Q2b) along the inner wall surface of the side circumference 20c. Therefore, regarding the inclination angles of the first curved surface and the second curved surface, "the inclination angle of the first curved surface <the inclination angle of the second curved surface" is set, and the inclination angle is mainly given to the second curved surface. Is desirable.

The curvature and inclination angle of each of the first curved surface and the second curved surface of the baffle member 25 are set in advance by empirical knowledge or simulation experiments. In particular, since the inclination angle of the second curved surface almost determines the rising angle of the ascending swirl flow (Q2b), it is desirable to conduct a simulation experiment in advance. The shape and size of the fuel auxiliary tank 20 and the maximum rating of the oil feed pump 53 are desirable. The most appropriate rising angle of the rising swirl flow (Q2b) (for example, rising when the rising swirl flow (Q2b) reaches the highest level by giving the pressure, the viscosity of the fuel, the temperature, etc. as parameters to a predetermined model formula. Angle), and the inclination angle of the second curved surface is set based on the rising angle.

Further, since the first curved surface of the baffle member 25 directly receives the fuel injection flow (Q2a), the baffle member 15 and its fixing are not deformed even by the continuous fuel injection flow. It is necessary to have strength, and it is desirable that the baffle member 25 and the attachment member are made of the same material as the wall surface of the fuel auxiliary tank 20. As a method of fixing the baffle member 25, a structure may be used in which the baffle member 25 is reinforced by a supporting member whose one end is fixed to the bottom surface 20a or the side circumference 20c.

The first guide members 26, 27 are formed of plate-shaped members whose side surfaces in the longitudinal direction have the same curvature as the inner wall surface of the side circumference 20c, and are provided with a predetermined inclination angle in the longitudinal direction to form the first circumference of the side circumference 20c. It is fixed to the inner wall surface via a mounting member (not shown). The inclination angles of the first guide members 26 and 27 are set to be substantially the same as the inclination angle of the second curved surface of the baffle member 25, and the attachment position of the first guide members 26 and 27 is the dimension and shape of the baffle member 25. And it is preset according to the mounting position. The material of the first guide members 26 and 27 is the same as that of the baffle member 25.

As described above, in the fuel auxiliary tank 20 according to the second embodiment, the injection flow (Q2a) of the fuel that is fixed to the bottom surface 20a and is pressure-fed from the oil feed pump 53 through the inlet 23 is used for the fuel auxiliary tank. Since the structure is provided with the baffle member 25 that converts into the upward swirling flow (Q2b) along the inner wall surface of the side circumference 20c of the fuel cell 20, the fuel in the fuel auxiliary tank 20 is always supplied when the fuel is supplied to the fuel auxiliary tank 20. Since the upward swirling flow is induced in the fuel 100 and the fuel pressure-fed from the oil feed pump 53 is naturally agitated, the fuel 100 in the fuel auxiliary tank 20 can be made uniform. In particular, when the fuel is switched between different types of fuel, the fuel conversion can be performed without requiring a special operation (level swing) which has been performed conventionally. Further, since there is no restriction such as restraining the generator output at the time of fuel switching and the fuel switching can be performed at any time, the range of fuel operation can be expanded.

Further, in the second embodiment, the baffle member 25 is convexly curved substantially parallel to the first curved surface which is concavely curved with respect to the fuel injection flow (Q2a) and the inner wall surface of the side circumference 20c. The second curved surface is formed by fixing a member connected so that the horizontal cross-section has a substantially inverted S shape, to the bottom surface 20a in the vicinity of the inlet 23, and the first curved surface and the second curved surface. The surface is formed to incline to the side opposite to the inner wall surface of the side circumference 20c, and the fuel injection flow (Q2a) whose direction is changed by the first curved surface rises and swirls along the inner wall surface of the side circumference 20c. Since it is guided by the second curved surface so as to become the flow (Q2b), the injection flow (Q2a) of the fuel to be pumped is efficiently the swirling flow (Q2b) along the inner wall surface of the side circumference 20c. Can be converted to.

Further, in the second embodiment, the fuel injection flow (Q2a), which is fixed to the inner wall surface of the side circumference 20c and whose flow direction is changed by the baffle member 25, is moved upward (Q2b) along the inner wall surface of the side circumference 20c. ), the first guide member 26, 27 is provided to guide the flow path of the ascending swirl flow (Q2b) along the inner wall surface of the side circumference 20c to reduce the loss of the fuel. It is possible to realize natural agitation.

Further, since only the attachment of the baffle member 25 and the first guide members 26 and 27 having such a simple structure can realize efficient natural agitation of fuel without affecting the tank storage amount, the device can be realized. It is possible to realize a fuel auxiliary tank that can stir the fuel in a relatively short time and with a low labor while suppressing the cost increase. Further, even when the baffle member 25 and the first guide members 26 and 27 are attached to the existing fuel auxiliary tank, a simple repair work is required, and an increase in the device cost can be suppressed.

(Embodiment 3)
FIG. 4 is an explanatory view of a fuel auxiliary tank 20 according to Embodiment 3 of the present invention, and FIG. 4(a) is a cross-sectional view of the fuel auxiliary tank 20 seen from above, illustrating the structure inside the tank and the flow of fuel. 4B shows the structure of the fuel auxiliary tank 20 and its peripheral devices in the fuel supply system, and a cross-sectional view of the fuel auxiliary tank 20 seen from the side illustrates the internal structure of the tank and the flow of fuel. .. The fuel auxiliary tank 20 of the third embodiment is provided with the second guide members 25Aa and 25Ab on the second curved surface of the baffle member 25 and the acceleration means 28 and 29 on the side circumference 10c of the fuel auxiliary tank 20. Regarding the points, it is different from the fuel auxiliary tank 20 of the second embodiment, and other than that, it is the same as the second embodiment.

First, the second guide members 25Aa and 25Ab are attached to the second curved surface of the baffle member 25, and the fuel injection flow (Q2a) whose direction is changed by the first curved surface is along the inner wall surface of the side circumference 20c. Since it is guided by the second curved surface and the second guide members 25Aa and 25Ab so as to have an ascending swirl flow (Q2b), the injection flow (Q2a) of the fuel to be pumped is more efficiently generated in the side circumference 20c. It becomes possible to convert into an upward swirling flow (Q2b) along the inner wall surface.

Further, a propeller 28 that is rotated by the drive of a motor 29 is attached to the inner wall surface of the side periphery 10c of the fuel auxiliary tank 20. The mounting position of the acceleration means (propeller 28 and motor 29) is set so that the direction of the flow generated by the rotation of the propeller 28 overlaps the flow of the upward swirling flow (Q2b) along the inner wall surface of the side circumference 20c. Is desirable. As a result, the flow of the upward swirling flow (Q2b) along the inner wall surface of the side circumference 20c can be accelerated.

In the case where the auxiliary fuel tank 20 has a large storage capacity and a high-viscosity fuel is used, the ascending swirl flow (Q2b) reaches the upper layer of the fuel 100 only by the injection flow of the fuel at the maximum rated pressure of the oil feed pump 53. It is also possible that you may not get it. Even in such a case, if the ascending swirl flow (Q2b) can be accelerated to reach the upper layer of the fuel 100 by utilizing the accelerating means (propeller 28 and motor 29) in an auxiliary manner, The stirring of can be surely performed.

The modification in which the acceleration means (propeller 28 and motor 29) is added to the second embodiment can be applied to the first embodiment.

Although the embodiments of the present invention have been described above, the specific configuration is not limited to the above-mentioned embodiments, and even if there is a design change or the like within a range not departing from the gist of the present invention, Included in the invention. For example, in the first embodiment, the baffle member 15 is fixed to the bottom surface 10a near the delivery port 14, but the baffle member 15 having the same structure is fixed to a substantially central position of the bottom surface 10a, and the length of the first guiding member 16 is increased. Even if the structure is shortened, it is possible to obtain substantially the same effect as that of the first embodiment.

Further, in the second embodiment, the baffle member 25 is fixed to the bottom surface 20a in the vicinity of the inlet 23, but the baffle member 25 having the same structure is fixed at a substantially central position of the bottom surface 20a, and the length of the first guide member 26 is increased. Even if the structure is shortened, it is possible to obtain substantially the same effect as in the second embodiment.

10, 20 Fuel auxiliary tank 10a, 20a Bottom surface 10c, 20c Side circumference 11 Fuel meter 12 Heater heating tube 13,23 Inlet port 14,24 Outlet port 15,15A to 15C,25 Baffle member 15Aa to 15Ac, 25Aa, 25Ab No. 2 guide member 15Ba, 15Bb mountain part 15Ca curved surface 16, 17, 26, 27 first guide member 28 propeller (accelerator)
29 Motor (accelerating means)
51, 52 Adjustment valve 53 Oil feed pump (first liquid feeding means)
54 Fuel injection pump (second liquid feeding means)
61,62 Fuel storage tank 100 Fuel Q1a, Q2a Fuel injection flow Q1b, Q2b Upward swirling flow

Claims (7)

A first type liquid fuel, a second type liquid fuel having a viscosity or a specific gravity different from that of the first type liquid fuel, or a fuel auxiliary tank provided in a fuel supply system for a load operating with the mixed liquid fuel as fuel. There
The fuel supply system supplies a first liquid feeding means for pressure-feeding the first type liquid fuel or the second type liquid fuel to the inlet of the fuel auxiliary tank, and fuel delivered from the outlet of the fuel auxiliary tank. A second liquid sending means for sending under pressure to the load,
The injection flow of the fuel, which is fixed to the bottom of the fuel auxiliary tank and is pressure-fed from the first liquid feeding means via the inlet of the fuel auxiliary tank, is swung up along the inner wall surface of the side periphery of the fuel auxiliary tank. baffle member for converting the flow, it has a,
The baffle member has a curved surface that is curved in a concave shape with respect to the injection flow of the fuel, and has a curvature radius on a side opposite to the rising swirl flow that is larger than a curvature radius on the direction side of the rising swirl flow.
A fuel auxiliary tank characterized in that A first type liquid fuel, a second type liquid fuel having a viscosity or a specific gravity different from that of the first type liquid fuel, or a fuel auxiliary tank provided in a fuel supply system for a load operating with the mixed liquid fuel as fuel. There
The fuel supply system supplies a first liquid feeding means for pressure-feeding the first type liquid fuel or the second type liquid fuel to the inlet of the fuel auxiliary tank, and fuel delivered from the outlet of the fuel auxiliary tank. A second liquid sending means for sending under pressure to the load,
The injection flow of the fuel, which is fixed to the bottom of the fuel auxiliary tank and is pressure-fed from the first liquid feeding means via the inlet of the fuel auxiliary tank, is swung up along the inner wall surface of the side periphery of the fuel auxiliary tank. It has a baffle member that converts into a flow,
The baffle member has a curved surface that curves concavely with respect to the fuel injection flow, is fixed to the bottom of the fuel auxiliary tank in the vicinity of the delivery port, and the curved surface is formed to incline toward the delivery port side. When the curved surface is viewed in the fuel injection flow direction, the curved surface is formed so as to cover the delivery port .
Fuel auxiliary tank you wherein a. A first type liquid fuel, a second type liquid fuel having a viscosity or a specific gravity different from that of the first type liquid fuel, or a fuel auxiliary tank provided in a fuel supply system for a load operating with the mixed liquid fuel as fuel. There
The fuel supply system supplies a first liquid feeding means for pressure-feeding the first type liquid fuel or the second type liquid fuel to the inlet of the fuel auxiliary tank, and fuel delivered from the outlet of the fuel auxiliary tank. A second liquid sending means for sending under pressure to the load,
The injection flow of the fuel, which is fixed to the bottom of the fuel auxiliary tank and is pressure-fed from the first liquid feeding means via the inlet of the fuel auxiliary tank, is swung up along the inner wall surface of the side periphery of the fuel auxiliary tank. It has a baffle member that converts into a flow,
The baffle member has a first curved surface curved in a concave shape with respect to the fuel injection flow and a second curved surface curved in a convex shape substantially parallel to the side peripheral surface of the fuel auxiliary tank. Is fixed to a bottom portion of the fuel auxiliary tank in the vicinity of the inlet, and the first curved surface or the second curved surface is The fuel auxiliary tank is formed so as to be inclined to the side opposite to the inner wall surface of the side circumference ,
Fuel auxiliary tank you wherein a. A first guide, which is fixed to the inner wall surface of the side of the fuel auxiliary tank and guides an injection flow of the fuel whose flow direction is changed by the baffle member, into a rising swirl flow along the inner wall surface of the side circumference of the fuel auxiliary tank. The fuel auxiliary tank according to any one of claims 1 to 3, further comprising a member. A second guide member fixed to the curved surface of the baffle member for guiding an injection flow of the fuel, the flow direction of which is changed by the baffle member, into an ascending swirl flow along the inner circumferential wall surface of the fuel auxiliary tank; The fuel auxiliary tank according to claim 2 , characterized in that it has. The fuel injection flow, which is fixed to the first curved surface or the second curved surface of the baffle member and whose flow direction is changed by the baffle member, becomes a rising swirl flow along the side circumferential inner wall surface of the fuel auxiliary tank. The fuel auxiliary tank according to claim 3, further comprising a second guiding member that guides the fuel auxiliary tank. Is installed in the side peripheral inner wall surface of the fuel auxiliary tank, one of claims 1 to 6 characterized in that it has an accelerating means for accelerating the upwardly whirling flow along the side peripheral inner wall surface of the fuel auxiliary tank The fuel auxiliary tank according to item 1.

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